Polar‐Electrode‐Bridged Electroluminescent Displays: 2D Sensors Remotely Communicating Optically |
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Authors: | Xiuru Xu Dan Hu Lijia Yan Shaoli Fang Clifton Shen Yueh‐Lin Loo Yuan Lin Carter S Haines Na Li Anvar A Zakhidov Hong Meng Ray H Baughman Wei Huang |
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Affiliation: | 1. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, China;2. Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, China;3. Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX, USA;4. Department of Chemical and Biological Engineering and the Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, USA;5. Shaanxi Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, China |
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Abstract: | A novel geometry for electroluminescent devices, which does not require transparent electrodes for electrical input, is demonstrated, theoretically analyzed, and experimentally characterized. Instead of emitting light through a conventional electrode, light emission occurs through a polar liquid or solid and input electrical electrodes are coplanar, rather than stacked in a sandwich configuration. This new device concept is scalable and easily deployed for a range of modular alternating‐current‐powered electroluminescent light sources and light‐emitting sensing devices. The polar‐electrode‐bridged electroluminescent displays can be used as remotely readable, spatially responsive sensors that emit light in response to the accumulation and distribution of materials on the device surface. Using this device structure, various types of alternating current devices are demonstrated. These include an umbrella that automatically lights up when it rains, a display that emits light from regions touched by human fingers (or painted upon using a mixture of oil and water), and a sensor that lights up differently in different areas to indicate the presence of water and its freezing. This study extends the dual‐stack, coplanar‐electrode device geometry to provide displays that emit light from a figure drawn on an electroluminescent panel using a graphite pencil. |
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Keywords: | AC displays electroluminescence polar electrodes sensors |
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